2024-03-28T08:34:33Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/241012022-01-21T12:34:36Zcom_10261_129com_10261_6col_10261_382
Biochemical mechanisms of stone alteratio carried out by filamentous fungi living in monuments
Torre, María de los Ángeles de la
Gómez Alarcón, Gonzalo
Vizcayno, Carmen
García-González, M. T.
Acid-producing fungi
Biodeterioration
Citrates
Cation complexation
Oxalates
Rock-decay
19 pages, figures, and tables statistics.
Biochemical weathering mechanisms carried out by Penicillium frequentans and
Cladosporium cladosporoides on unaltered sandstone, granite and limestone were studied
using FTIR, X-ray diffraction, atomic absorption and flame photometry. Strains belonging
to both fungal species, isolated from the facades of two Spanish Cathedrals, were used.
Large amounts of oxalic, citric and gluconic acids were produced by P. frequentans in
broth cultures. These metabolites caused extensive deterioration of clay silicates, micas and
feldspars from both sandstone and granite and also of calcite and dolomite from limestone,
as a result of high cation release and organic salts formation such as calcium, magnesium
and ferric oxalates and calcium citrates. Comparatively, the biodegradative effect brought
about by C. cladosporoides was much less than that caused by P. frequentans. Neither
organic acids nor organic salts were formed by C. cladosporiodes samples.
It is concluded that filamentous fungi are able to cause an extensive weathering of stone,
due principally to organic acid excretion, although other metabolites participate to a lesser
extent in these deteriorative processes. Ecological adaptative mechanisms, such micronutrients
uptake and trivalent cations chelation (Fe3+ and A13+) are derived from fungal
growth on stone monuments.
This study was supported by CICYT (PAT 89-0767-C04) and a grant
from the Ministerio de Education y Ciencia (Spain) to M” Angeles de la
Torre.
The work reported here formed part of a Ph.D Thesis submitted to the
Faculty of Sciences of the Universidad Autonoma de Madrid (M. A. de la
Torre 1992).
The authors wish to thank Dr. P. Aparicio for the improvement of the
English version of the text, Dr. G. Almendros for informatic programs to
perform infrarred analyses and Mr. A. Hurtado for technical assistance in
Figures drawn in the text.
Peer reviewed
2010-05-10T07:58:58Z
2010-05-10T07:58:58Z
1993
artículo
http://purl.org/coar/resource_type/c_6501
Biogeochemistry 19: 129-147 (1993)
0168-2563
http://hdl.handle.net/10261/24101
10.1007/BF00000875
en
http://dx.doi.org/10.1007/BF00000875
open
964525 bytes
application/pdf
Kluwer Academic Publishers